Help! Santa stuffed up can 3ds firmware be changed from usa to australia

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Help! Santa stuffed up can 3ds firmware be changed from usa to australia

Hi all, First of all I would like to say what a great site this is.
I am a noobie and was hoping that some one can help me!
We bought our sons 3ds from america this year all things were going fine untill santa bought our son mariokart 7 for 3ds Australian version.
My son is most upset and desperatly wants to play the game. I have trawlled the internet for days now but can't find an answer how to change from Usa to Australia all his ds games work fine. (from Australia)